Introduction to the Data Feed App

Tutorial Part 1: Your First Modsefa Application - A Data Feed

Welcome to your first Modsefa tutorial! We'll start by building a Data Feed with an Archive— a simple but powerful dApp that demonstrates the core principles of the Modsefa framework.

This application will allow a user to create a named data feed, publish content to it, and automatically maintain a complete, on-chain history of all previous updates.

What We'll Build

• A single-validator application that manages all of its own state.
• A unique configuration state that defines the feed's name and owner.
• Multiple data states where each new update is marked as "Active" and the previous one is automatically "Archived".
• Two clear user actions: one to initialize the feed and one to update its content.

Why This is a Great Starting Point

The Feed App is the perfect introduction to Modsefa because it's simple enough to understand quickly but powerful enough to showcase the core benefits of the framework:

1. Single Source of Truth: You will write one specification that defines the entire application. From this, Modsefa generates everything else.
2. Declarative Actions: Instead of writing transaction-building logic, you will declare what an action should do (e.g., "create a new active entry, and archive the old one"). Modsefa handles the implementation.
3. Automatic State Management: You'll see how Modsefa's StateRepresentable typeclass manages the on-chain representation of your data, including the use of identifying tokens.
4. Guaranteed Consistency: Because both the on-chain validator script and the off-chain transaction builder are generated from the same source, they are guaranteed to be consistent, eliminating a huge category of common bugs.

This tutorial will give you a solid foundation in the key concepts of Modsefa, preparing you to tackle more complex, multi-validator applications like the Subscription Service.